package thread;

public class demo13 {
    private static int counter = 0;

    public static  void add() {
        synchronized(demo13.class) {
            counter++;
        }
    }
    public static void main(String[] args) throws InterruptedException {
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                add();
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                add();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(counter);
    }
}
